Cylinder-grinding machine.



G. A. FRIESS.

CYLINDER GRINDING MACHINE.

APPLICATION FILED Nov. 2a. IsI.

Patented May 29, 1917.

5 SHEETS-SHEET I.

G. A. FRIESS.

CYLINDER GRINDING MACHINE.

APPLICATION FILED NOV. 23. 1916.

1.22%??5. Patented May 29,1917.

5 SHEETS-SHEET 2.

QNX/m I G. A. FRIESS.

CYLINDER GRINDING MACHINE.

APPLICATION FILED Nov. 23. IsIe.

3192279775. Patented May 29,1917.

5 SHEETS-SHEET 3.

fig 3- G. A. FRIESS.

cYLlNDER GRINDING MACHINE.

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G. A. FRIESS.

CYLINDER GRINDING MACHINE.

lyggvg'o APPLICATION FILED NOV. 23. ISIS- Patented May 29 5 SHEETS-SHEET5.

miren enligne ramena @Junren GUSTAV A. FRIESS, OF CHICAGG, ELLIN 01S.

CYLINDER-GRINDING MACHINE.

naamw.

Specification of Letters atent.

A1Patented May 29, 1917.

Application iled November 23, 1916. Serial No. 133,048. y

A pertains to make and use the same.

aby

This invention relates to cylinder grind/ ing machines vand has for itsobject to provide a machine of this character which will automaticallyaccurately grind cylinders to anyv desired depth.

The invention is particularly designed and adapted for grinding andpolishing -the printing cylinders of printing presses, and moreparticularly the copper cylinders of socalled intaglio ory rotogravurepresses, but may be used for grinding cylinders of every descriptionincluding lithographic stones and the like.

The particular objects of the invention are:

First: To provide a machine of the character described in which thegrinding or polishing element bears with uniform pressure upon thecylinder surface so as to uni- Y `formly grind all parts of the surfacewith which it comes in contact.

, Second: To provide cylinder grinding means in which the grinding orpolishing element is given a compound motion whereby'lall parts of itssurface are brought `substantially equally in contact with all partsofthe cylinder surface to be ground.

Third: To provide a machine of this character in which the movement ofthe grinding or polishing element longitudinally ofv the cylinderbeingground is automatically reversed as said Velement reaches therespective ends of the cylinder operated upon.

Fourth: To provide a machine of this character in which the rapidity ofthe grind- -ing may be changed and varied without varying the speedofthe machine or any part thereof and without changing the grindingelement.

Other objects of the .inventionr will be Y fully understood from thefollowing specication.

' "lfhe invention consists in the features of Fig. -2- is a top planviewof the same.

Fig. -3- is an end elevation of the same.

Fig. -4-- is a vertical transverse section of the same on the line 4 4of Fig. -2.

Fig. -5-- is a vertical longitudinal section of the same on the line5--5 of Fig.y -2-.

zontal section on the line 6-6 of Fig. -5--.

The said machine comprises a suitable frame which includes the standards1 and the flanged plate or table 2 carried thereby and constituting thesupport for the carriage 3, which is movable longitudinally of saidplate 2, the edge portions of the latter being beveled to'iit thebeveled inner faces of the flanges 4 of the carriage and constituting adove-tail guide for said carriage 3 which is thus heldfirmly down uponthe plate 2 and is held against lateral movement relatively to the same.Said table or plate 2 is provided midway between its side edges with alongitudinal slot 5 into which the middle portion 6 of the carriage 3projects, the latter being provided with a bushing 7 internally threadedto receive the screwshaft 8 mounted midwaybetween the side edges of theslot 5, and having its axis disposed substantially in the plane of theupper face of the plate 2. The said screw-shaft 8 is journaled at itsends in bearings 9 and 10 on the frame of the machine, and is providedbetween its endsl with a relatively long spur pinion 11. The lattermeshes with a spur gear 12 on a short countershaft journaled in thebearing 13 in the yoke arm 14 integral with the standard 1 at one endVof the machine. Axially alined with said shaft carrying said spur gear12 is a similar short shaft 15 journaled in the bearings 16 and 17. Onsaid shaft 15 are two loose bevel pinions 18 and 19 respectively,meshing with the bevel pinion 20 onfaivertical shaft 21 which bracket 24carried by one of the standards v of the frame. Said shaft 21 carries abevel pinion 25 meshing nwith a bevel pinion 26 on a countershft 27journaled in a bearing 28 of one of thestandards 1. rThe latter carriesa spur gear 29 meshing with a spur gear 30 on a countershaft 31 disposedabove the same. It also carries a spur gear 32 meshing with a spurpinion 33 on the drive-shaft 34, the latter being equipped with astepped pulley 35 for rotating the shaft carrying the cylinder to beground at various speeds in rotated in one direction; whereas, when saidclutch member 38 is engaged with the clutch face of the gear 19 it willbe rotated in the opposite direction thereby obviously varying thedirection of. movement of said carriage 3.

rlhe said carriage 3 is provided with a downwardly extending projection39 at its rear edge which is equipped at its lower end with a sleeve 40through which a shaft 41 passes; the latter being journaled in bearingsin the ends of the brackets 42 mounted on the frame of the machine andlongitudinally movable in said bearings. The said shaft is equipped withcollars 43 and 44 which are adapted to be engaged by said sleeve 40 forimparting longitudinal movement to said shaft. The latter is furtherprovided with an annularly grooved collar 45 in which the forked end 46of a lever 47 engages, the latter being pivotally mounted between itsends on a projection 48 on the frame of the machine, and having itsbifurlcated other end engaging in the annular groove between the ends ofthe clutch member 38 so that as the-sleeve 40 engages the collar 44 saidshaft 41 will be moved in ya direction to cause the clutch member 38 tomesh with the clutch face of the gear 18, and when said sleeve v40engages the collar 43 said clutch member will be thrown into engagementwith the clutch face of the gear 19.

Mounted on the shaft 29 is an eccentric 50 engaged with an eccentric rod51 connected at its upper end with one arm of a bellcrank lever 52pivotally mounted in a bracket 53 on thel frame of the machine. Theother arm of said lever 52 is bifurcated and engages in the annulargroove of a collar 54 mounted at one end of the screw-shaft 8 so thatduring the rotation of the shaft 31 reciprocal motion will be impartedto said shaft 8 thus imparting a reciprocable motion to the carriage 3independently of the reciprocal motion imparted to the same by itsthreaded engagement with the screw-shaft 8 and the rotationof thelatter.

The said carriage 3 is provided with transverse guides 55 in whichthe-cbase-plate of a carriage 56 engages, the latter being reciproshaft8. The carriage 56 is provided with aTh pair of brackets 62 carryingbearings in which the shaft 57 is journaled between its a.

ends and which are adapted to move longitudinally of said shaft inaccordance with the several reciprocable movements of the carriage 3longitudinally of the said shaft. Said shaft 57 is provided throughoutits length with a key-way or groove 63. Disposed between the bearings ofthe bracket 62 is the hub 64 of an eccentric 65 which is carried by saidshaft 57 and is keyed thereto, but is movable longitudinally thereofwhile held against rotation relatively thereto, as will be obvious. Aneccentric strap 66 carried by said eccentric and constituting a part ofthe plunger or connecting rod 68, which is pivotally secured to thecarriage 56 serves to impart -reciprocal movement to the carriage 56relatively to' the carriage 3. The carriage 56 carries the bearings 69for the shaft or pin 70 by means of which an arm 71 is pivotally engagedwith `said carriage 56. rlhe said arm 71 is provided with a dependingprojection 72 carrying the bearing 73 for one end of a screw-shaft 74which is rotatable in said bearing and is held against longitudinalmovement relatively to the same by means of the collars 75 and 76. Thesaid shaft 74 has right and left threads 77 and 78 respectively, thethreads 77 being' engaged with a clamping member 79 and the threads 78with a similar member 80, both said members being movable longitudinallyof the arm 71 in a suitable guide groove 81 in the lower face of thelatter. As 'f said shaft 74 is rotated said member 79 and will be movedtoward and from each other respectively to engage and release thegrind-stone or grinding or polishing element 82. The latter is adaptedto rest upon 1 the surface of the cylinder 83 to be ground which iscarried by a shaft 84 extending parallel with the shaft 8 and journaledin bearings 85 in brackets 86 on the frame of the machine. The saidshaft 84 carries a stepped pulley 87 at one end which is geared by meansof a belt 88 with the pulley 33 on the drive shaft 32 for rotating saidshaft 84 at different speedsf The arm 7l also carries a rail 89 on whicha -Weight 90 is reciprocably movable longitudinally of the arm 71 andtransversely of the shaft 8. The said rail 89 projects through thevertical plane of the axis of the pin 70 so that the weight 90 may beused to counterbalance the weight of the arm 7l or increase the weightof the latter; depending upon the pressure desired to be applied to thegrinding or polishing element 82.

Vhile it is believed that the operation of Y the machine will be wellunderstood from the foregoing description, the said operation isbrieflyreviewed as follows:

The cylinder 83 to be ground is rst mounted on the shaft 84. Thegrinding element 82 is then mounted between the clamping members 79 and80 and the weight 90 then adjusted to provide the desired degree ofpressure on the surface of the cylinder 83. The drive-shaft 32 is thenrotated thereby, in the manner described, effecting a constant rotationof the shaft 8 whereby to impart slow longitudinal movement to thecarriage 3 relatively to the cylinder 83, the direction of movement ofthe carriage 3 being changed at intervals determined by the engagementof the sleeve 40 with the collars 43 and 44 respectively, ashereinbefore set forth. During the rotation of the screwshaft 8 thelatter is reciprocated by means of the arm 52 of the shaft 53, the otherarm 53a of which is connected by vmeans of the connecting rod with theshaft 31 to impart rocking motionto Asaid shaft 53. Thus, while thecarriage 3 moves gradually in a general direction itis, during said'interval, reciprocated relatively rapidly, the total movement being thuscompound and this being obviously imparted to the. grinding element 82.Through the reciprocal motion imparted to the carriage 56 by means oftheeccentric 65 the grinding or polishing element 82 is at the vsame timegiven a: trans- -form wear throughout, and the cylinder surface will atthe same time be ground veny `uniformly and exactly 'over its entiresurleft in the machine and the speed of its rotation, the latterobviously also influencing the rapidity of grinding or polishing, the

element 82 being interchangeable to produce y preferably very slow andbecause of the fact I that the middle portion of the grinding faceparallelv with the cylinder aXis'is subjected to twice the wear of theedge-portion of said element, the grinding face of the latter willbecome gradually concave, such concavity being of larger radius than thecylinder surface acted upon. This I find to be very advantageous in thatonly a relatively small area of grinding surface is applied to thecylinder surface at any time and this area is continuously changing,thereby entirely preventing Vscoring or unequal grinding of the cylindersurface andy insuring the utmost accuracy and uniformity of grinding.

The foregoing applies with equal force to the polishing element when thelatter is used.

My said machine is very simpleand eiiicient. It will be obvious that theconstruction thereof may be modified and varied to a considerable extentas mechanical skill and judgment may dictate without departing from theinvention as defined in the appended claims.

I claim as my invention:

1. A machine of the kind specified, including a rotatable supportfor'the cylinder to be ground, means for rotating the same, -a grindingelement, mechanism for moving the same longitudinally of the cylinderwhile in contact therewith and fromend to end of the latter, andmechanism for reciprocating said element during its said movement.

2. A machine of the kind /specified, including a rotatable support forthe cylinder to be lground, means for rotating the same, a grindingelement, mechanism for movingv the same longitudinally of the cylinderwhile in contact therewith and from end to end of the latter, andmechanism for reciprocating said element in said direction during itssaid movement. I

3. A machine ofthe kind specied, including a rotatable support for theylinder to be ground, means for rotating the same, a grinding element,mechanism for moving the same longitudinally of the cylinder while incontact therewith and from end to end of the latter, and mechanism forimparting rapid reciprocal movement of relatively short stroke to saidelement in said direction during its said' movement. 4.j A machine ofthe kind specified, including a rotatable support for the cylinder to beground, means for rotating the same, a

grinding element, mechanism for moving the same longitudinally of thecylinder while in contact therewith and from end to end of the latter,and mechanism for` reciprocating rection of travel and during thelatter.

5. A machine of the kind specified, including a rotatable support forthe cylinder to be ground, means for rotating the same, a

grinding element, mechanism for movingI the same longitudinally' of thecylinder While in contact therewith and from end to end of the latter,and mechanism for imparting rapid reciprocal movement of relativelyshort stroke to said element transversely of its general direction oftravel and during the latter.

6. A machine of the kind specified, including a rotatable support forthe cylinder to be ground, means for rotating the same, a.

grinding element, mechanism for moving the same longitudinally of thecylinder While in contact therewith and from end to end of the latter,and mechanism for imparting rapid reciprocal movement of relativelyshort stroke to said element in said direction during its said movement,and mechanism for imparting reciprocal movement to said grinding elementlaterally of its general direction of travel and simultaneously with thecompound longitudinal movement thereof.

7 A machine of the kind specified including means for rotating acylinder to be ground, a grinding element, a carriage for the sameadapted to maintain the said grinding element in surface contact Withsaid cylinder by gravity, and means for moving said carriagelongitudinally of said cylinder duringrotation of the latter.

8. A machine of the kind specified including means for rotating 'acylinder to be ground, a grinding element, a carriage for the sameadapted to maintainthe said grinding element in surface contact Withsaid cylinder by gravity, a Weight movably mounted on said carriage andadapted to be shifted in position relativelyto said grinding element topartially counterbalance'the same to lessen the pressure exerted therebyon the cylinder surface or to add its Weight in Whole or in part to suchpressure to increase the same during its said movement.

9. A machine of the kind specified includ- L ing means for rotating acylinder to be grou/nd, a carriage movable longitudinally of saidcylinder, a pivoted arm on said carriage adapted to receive a grindingelement to be held by gravity in contact with the cylinder ,fsurface, arail on said arm extending trans- "ver-sely of the pivotal axis thereofand beyonolfboth sides of thevertical plane of said axis,` a Weightmovable on said rail and adapted to increase and counterbalanoerespectively the Weight of said arm and said rlndinO element and meansfor movin said carriage longitudinally of said cylinder during rotationof the latterw -10. A machine of the kind specied in-` cluding means forrotating a cylinder to be i ground, a carriage movable longitudinally ofsaid cylinder, a pivoted arm on said carriage adapted to receive agrinding element to be held by gravity in contact With the cylindersurface, a rail on said arm extending transversely of the pivotal axisthereof and beyond both sides of the vertical plane of said axis, aWeight movable on said rail and adapted to increase and counterbal'ancerespectively the Weight of said arm and said grinding element, means formoving said carriage longitudinally of said cylinder, and means forimparting reciprocal motionto said carriage during rotation of the saidcylinder.

11. A machine of the kind specified in cluding means for rotating acylinder to be ground, a grinding element, a carriage for the sameadapted to maintain the said grinding element in surface contact Withsaid cylinder by gravity, and means for imparting reciprocal motion. tosaid carriage during rotation of said cylinder.

12. A machine of the kind specified including means for rotating acylinder to be ground, a grinding element, a carriage for the sameadapted to maintain the said grinding element in surface contact Withsaid cylinder by gravity, and means for imparting compound reciprocalmotion to said carriage during rotation of said cylinder.

13. A machine of the kind specified including means for rotating acylinder to be ground, a carriage movable longitudinally of saidcylinder, a pivoted arm on said carriage adapted to receive a grindingelement to be held by gravity in contact 'with the cylinder surface, arail on said arm eX- transversely of the pivotal axis .means forimparting compound reciprocal motion'to said carriage" during rotationof said cylinder.l

14. A machine of the kind specified in-. cluding means for rotating acylinder to be ground,-a carriage movable longitudinally ofsaidcylinder,a pivoted arm on said carto be held by gravity in contact With thecylinder surfaceya rail on said arm exi riage adapted to receive agrinding element tending transversely of the pivotal axisthereof andbeyond both sides of the vertical Vplane of said axis, a Weight movableon said rail and adapted to increase and counterbalance respectively theWeight of said arm and said grinding element, and l means for impartingcompound reciprocal motion to said carriage in relatively transversedirections during rotation ofsaid cylinder. Y y

15. A machine of the kind specified including means for rotating acylinder to be ground, a carriage movable longitudinally of saidcylinder, a pivoted arm on said carriage adapted to receive a grindingelement to be held by gravity in ycontact with the cylinder surface, arail on said arm extending transversely of the pivotal axis thereof andbeyond both sides of the vertical plane of said axis, a Weight movableon said rail and adapted to increase and counterbalance respectively theWeight of said arm and said grinding element, and means for impartingcompound reciprocal motion to said carriage during rotation of saidcylinder in the direction of the axis thereof, and means forsimultaneously therewith imparting reciprocal motion to said carriagelaterally of the aXis of said cylinder.

16. A machine of the kind specified including means for rotating acylinder to be ground about its axis, a carriage, a grinding elementcarried thereby adapted to engage the cylinder surface, means for movingsaid carriage from end to end of said cylinder during rotation thereof,means for automatically reversing the travel thereof as said grindingelement reaches the respective limits of its movement, and means forreciprocating said carriage and the mechanism for imparting theaforesaid movement thereto during such movement thereof. Y

17; A machine of the kind specified including means for rotating acylinder to be ground about its axis, a carriage, a grinding elementcarried thereby adapted to engage the cylinder surface, means for movingsaid carriage fromi end to end of said cylinder during rotation thereof,means for automatically reversing the travel thereof as said grindingelement reaches the respective limits pf its movement, and means forreciprocating said carriage and the mechanism for imparting theaforesaid movement thereto during such movement thereof, and in thedirection of such movement.

18. A machine ofthe kind specified including means for rotating acylinder to be ground about its aXis, a carriage, a grinding elementcarried thereby adapted to engage the cylinder surface, means for movingsaidcarriage from end to end of said cylinder during rotation thereof,means for automatically reversing the travel thereof as said grindingelement reaches the respective limits of its movement, and means forreciprocating `said carriage -and the mechanism for imparting theaforesaid 4,movement thereto during such movement thereof, and in thedirection of such vmovement, and means for imparting reciprocal movementto said grinding element laterally of the movement of said carriage andduring the aforesaid movement thereof.

ln testimony whereof l have signed my name in presence of tWosubscribing Witnesses.

GUSTAV A. FREESS. Witnesses:

M. Bom, J. J.. Yonne.

